I toasted the blades tips on my 7R so bad, they got stuck on the radiator shroud. Some mechanics say this is not that uncommon with single walled aftermarket pipes (as most of them are - mine was stock double walled).
I, too, am interested in an aluminium fan blade (for the 12R). Muzzy, Lockhart Phillips, MAW and Dennis Kirk didn't seem to have one. Maybe Parts Unlimited, Tucker Rocky or White Brothers might have one for the Busa (or a crossover from a different model might work).
It good to keep an eye ont the condition of the fan blades. If they get too melted to work properly, the "best" thing that could happen is you blow a fuse. You can guess what the "worse" things would be. Still, an unbalanced fan could toast the fan motor.
In the case of my 7R, it was sold as a complete unit (fan, motor and shroud) for a mere $450! Price one for a Busa and you'll be equally shocked! Fans are like leathers... cheap insurance.